WebJun 21, 2009 · Note you would have to take into account during the last row there will be no 'i+1' so you will have to use an if statement to catch that. Share Improve this answer WebOct 2, 2014 · 3. You could use a SqlDataReader for reading the data from your database and simply use it to store data from your database in your variables. int professorId; private static void ReadOrderData (string connectionString) { string queryString = "select ID_ST from [dbo]. [PROFESSOR];"; using (SqlConnection connection = new SqlConnection ...
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WebDec 15, 2015 · It will only filter in memory if you are doing something like this: context.tbl1.ToList ().where (obj=>obj.name="Robin Banks"). Because you first load everything in the memory and then filter the data with the where () statement. But like it is done by you the filter is applied on the database. – croxy Dec 15, 2015 at 9:56 WebAug 22, 2012 · Below it the code I'm using to connect to an Access database and pull the values from the query. Problem is.. I cannot get any values back from the reader object. I can see that there are the correct amount of rows, however I keep getting an InvalidOperationException (whether I use GetValue() or GetString()) saying "No data …
WebMar 15, 2015 · If you want to store the rows and columns into a collection of some sort, you can try using a List and Dictionary which will let you add as many rows as you need. List> rows = new List> (); … WebNov 23, 2014 · how to get the multiple rows from db using c# Nov 23 2014 12:17 AM hiii.. i want to get multiple rows from database... SqlCommand cmd = new SqlCommand …
WebDec 21, 2009 · Hi all, I have a problem regarding to Datagridview's Combobox column. There is a list I added to the combobox on datagridview like book names "ASP.NET", "MSSQL","AJAX". I get the code of these book names from my database and I can show them on combobox located on my datagridview. WebNov 26, 2009 · List paths = new List (); foreach (DataRow dr in dt.Rows) { string x = Convert.ToString (dr ["colName"]); ClassName check = new ClassName (); path = null; path = check.MyFunction (x, B, C); paths.Add (path); } return paths; And if you want to return dataset you can use the code below.
WebJan 11, 2014 · Main issue is your Get method in the Controller is setup to return a single Subject object, not a List. Your query looks correct. The main change would need to be as follows. public List Get (int id) { IQueryable query; return query = from Subjects in db.SubjectContext.Where (v => v.CreatedBy == id).ToList (); }
WebTo get all rows from an Azure Table Storage table using C#, you can use the CloudTable.ExecuteQuerySegmentedAsync () method to execute a query that retrieves … thoracic spine ddd icd 10WebJul 11, 2024 · This stored procedure should accept two integer input parameters - @startRowIndex and @maximumRows and use the ROW_NUMBER () function ordered by the ProductName field, returning … ultra etorqu a5 mid-tower atx gaming caseultraergo wireless split keyboardWebApr 24, 2024 · 0. To loop through the rows of a DataTable in c# you just need to do: foreach (DataRow myRow in DataSet_TheData.Tables [0].Rows) { //Work with myRow here. } This will loop through the 5 rows in the DataTable returned to you. Then, on each row you just access the value of a column for a specific row by using: thoracic spine discitis icd 10WebOct 6, 2024 · 2 Answers Sorted by: 5 iterate over all items using foreach loop: foreach (pojo p in calendarmstrDG.Items) { // do something with "p", e.g. access properties: p.SerialNo } DataGrid.Items collection contains elements of type object, so in foreach loop we have to specify exact type pojo to be able to access properties ultra event south africaWebJul 3, 2009 · C# List colValues = new List (); //for loop foreach (DataRow row in dt.Rows) { colValues.Add (row ["ColumnName"]); } //LINQ Query Syntax colValues = (from DataRow row in dt.Rows select row ["ColumnName"]).ToList (); //LINQ Method Syntax colValues = dt.AsEnumerable ().Select (r => r ["ColumnName"]).ToList (); VBWebJun 30, 2016 · List<> is a lot handier than DataTable, but if your table is huge you might be better off just using dt itself to avoid creating a near-duplicate data structure. It can index just like List<> after all. I say this having made the same mistake in the past and then running into huge data sets. List creation like this can be slow. :) –WebApr 24, 2024 · 0. To loop through the rows of a DataTable in c# you just need to do: foreach (DataRow myRow in DataSet_TheData.Tables [0].Rows) { //Work with myRow here. } This will loop through the 5 rows in the DataTable returned to you. Then, on each row you just access the value of a column for a specific row by using:WebSep 16, 2013 · The easiest way to copy one table to another database is to attach the second database to the first connection, and copy the data directly: ATTACH '...\test4.s3db' AS 'test4'; DROP TABLE IF EXISTS test4.MathRec; CREATE TABLE test4.MathRec (name text , score integer); INSERT INTO test4.MathRec SELECT * FROM MathRec;WebNov 23, 2014 · how to get the multiple rows from db using c# Nov 23 2014 12:17 AM hiii.. i want to get multiple rows from database... SqlCommand cmd = new SqlCommand …WebJun 17, 2024 · The normal way to do this is by instantiating your dbContext. public IQueryable GetCompanies () { using (var context = new MyContext ()) { …WebDataRow has an indexer that you can use: foreach (DataRow row in myDataSet.Tables [0].Rows) Console.WriteLine ("I'm in Column B: " + row ["D"]); You can access it via name or ordinal-index of the field. The third overload can be used if you have a reference of DataColumn and is used by the others after the column was found.Web2 days ago · Here, the WHERE clause is used to filter out a select list containing the ‘FirstName’, ‘LastName’, ‘Phone’, and ‘CompanyName’ columns from the rows that …WebMar 17, 2012 · You can get all rows from the grid by. var myData = grid.jqGrid ('getRowData'); or with respect of. var myData = grid.jqGrid ('getGridParam', 'data'); The last way can be used only with local datatype or in case of loadonce: true. It returns data not only from the current page, but all data from all pages. The getRowData method use …WebMay 28, 2015 · 1. SingleInlineQuery.zip. Sometimes a developer must show all the rows or just some rows on the same event and for that, generally developers use: A Stored …WebMar 15, 2015 · If you want to store the rows and columns into a collection of some sort, you can try using a List and Dictionary which will let you add as many rows as you need. List> rows = new List> (); …WebWith a SqlDataReader, everything has to be done row-by-row - sequential access. The advantage with a SqlDataReader is that you can process a very large recordset without having all the data in memory all at once. The disadvantage is that you can't do as you're asking. Your other alternative would be to drop the entire recordset into a DataTable ...WebAug 31, 2024 · 3. You replace the value of Subject.Text in each loop. That means it contains only the last value. You should concatenate the string. Subject.Text += dr …WebNov 26, 2009 · List paths = new List (); foreach (DataRow dr in dt.Rows) { string x = Convert.ToString (dr ["colName"]); ClassName check = new ClassName (); path = null; path = check.MyFunction (x, B, C); paths.Add (path); } return paths; And if you want to return dataset you can use the code below.WebMar 3, 2024 · reader.Read () itterates through the rows returned. You can use reader.HasRows () to determine if there are any rows Also try to use textbox.Text = reader ["ColumnName"].ToString (); as this is easier to read. To generate a unique textbox name var textBoxCounter =0; Inside your Read () loopWebAug 22, 2012 · Below it the code I'm using to connect to an Access database and pull the values from the query. Problem is.. I cannot get any values back from the reader object. I can see that there are the correct amount of rows, however I keep getting an InvalidOperationException (whether I use GetValue() or GetString()) saying "No data …WebThe DataTable has a collection .Rows of DataRow elements. Each DataRow corresponds to one row in your database, and contains a collection of columns. In order to access a single value, do something like this:WebOct 2, 2014 · 3. You could use a SqlDataReader for reading the data from your database and simply use it to store data from your database in your variables. int professorId; private static void ReadOrderData (string connectionString) { string queryString = "select ID_ST from [dbo]. [PROFESSOR];"; using (SqlConnection connection = new SqlConnection ...WebOct 6, 2024 · 2 Answers Sorted by: 5 iterate over all items using foreach loop: foreach (pojo p in calendarmstrDG.Items) { // do something with "p", e.g. access properties: p.SerialNo } DataGrid.Items collection contains elements of type object, so in foreach loop we have to specify exact type pojo to be able to access propertiesWebSep 5, 2009 · You can't get a count of rows directly from a data reader because it's what is known as a firehose cursor - which means that the data is read on a row by row basis based on the read being performed. I'd advise against doing 2 reads on the data because there's the potential that the data has changed between doing the 2 reads, and thus …Webprivate void getAgentInfo (string key)//"key" is your search paramter inside database { con.Open (); string sqlquery = "SELECT * FROM TableName WHERE firstname = @fName"; SqlCommand command = new SqlCommand (sqlquery, con); SqlDataReader sReader; command.Parameters.Clear (); command.Parameters.AddWithValue …WebApr 11, 2024 · how to linq pivot use reflection genric. Apr 11 2024 4:33 AM. from my sql view retunrs. so in asp.net core i need to return list of rows from dal as. as. pivot data on new column and get values from value coloumn for each year month jnum. how to use linq query and pivot ,reflection generic code for v1 to vn.WebDec 15, 2015 · It will only filter in memory if you are doing something like this: context.tbl1.ToList ().where (obj=>obj.name="Robin Banks"). Because you first load everything in the memory and then filter the data with the where () statement. But like it is done by you the filter is applied on the database. – croxy Dec 15, 2015 at 9:56WebFeb 27, 2011 · I'm writing a method to return an 'asset' row from the database. It contains strings, ints and a byte array (this could be an image/movie/document). Now for most row access I use the following method which returns a NameValueCollection as it is a light weight object, easy to use and cast int and strings.WebDec 30, 2024 · You can use Include to load data from other related tables. E.g. var products = _context.ProductsTbl .Include (p => p.branchTbl) .Include (p => p.catTbl) .ToList (); Please check Loading Related Data, which explains different methods to load related table data. Share Follow answered Dec 30, 2024 at 5:59 Mukesh Modhvadiya 2,168 2 25 32WebJan 11, 2014 · Main issue is your Get method in the Controller is setup to return a single Subject object, not a List. Your query looks correct. The main change would need to be as follows. public List Get (int id) { IQueryable query; return query = from Subjects in db.SubjectContext.Where (v => v.CreatedBy == id).ToList (); }WebDec 21, 2009 · Hi all, I have a problem regarding to Datagridview's Combobox column. There is a list I added to the combobox on datagridview like book names "ASP.NET", "MSSQL","AJAX". I get the code of these book names from my database and I can show them on combobox located on my datagridview.WebHow to get list of all database from sql server in a combobox using c# asp.net windows application try { string Conn = "server=.;User Id=sa;" + "pwd=passs;"; SqlConnection con = new SqlConnection (Conn); con.Open (); SqlCommand cmd = new SqlCommand (); // da = new SqlDataAdapter ("SELECT * FROM sys.database", con); cmd = new SqlCommand …WebJul 11, 2024 · This stored procedure should accept two integer input parameters - @startRowIndex and @maximumRows and use the ROW_NUMBER () function ordered by the ProductName field, returning …WebJun 5, 2012 · Note that you can specify such things as select r.PropertyName to get actual parts of the entry, should you want specific "columns". – muttley91. Nov 8, 2013 at 2:14. Add a comment. 11. You can use this code to select all rows : C# : var allStudents = [modelname]. [tablename].Select (x => x).ToList ();WebTo get all rows from an Azure Table Storage table using C#, you can use the CloudTable.ExecuteQuerySegmentedAsync () method to execute a query that retrieves …WebJun 21, 2009 · Note you would have to take into account during the last row there will be no 'i+1' so you will have to use an if statement to catch that. Share Improve this answerWebSep 15, 2024 · To retrieve data using a DataReader, create an instance of the Command object, and then create a DataReader by calling Command.ExecuteReader to retrieve …WebMay 1, 2015 · by default with select statement you can get only 100000 records.. so after that if you have to retrieve records you have to specify limit.. Select * from tablename LIMIT 10000000 (in your case 3 million then specify it)... Share Improve this answer Follow edited May 1, 2015 at 21:09 Farvardin 5,316 5 33 54 answered May 20, 2014 at 5:54 ultraeverdry.comWebDataRow has an indexer that you can use: foreach (DataRow row in myDataSet.Tables [0].Rows) Console.WriteLine ("I'm in Column B: " + row ["D"]); You can access it via name or ordinal-index of the field. The third overload can be used if you have a reference of DataColumn and is used by the others after the column was found. ultra ever dry company