Error: GridView does not contain a definition for 'ColumnCount'

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SQL-Server-2005

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here is my code

protected void Search_Click(object sender, ImageClickEventArgs e)
   {

       //grdTimeTable.Rows.Clear();
       grdTimeTable.ColumnCount = 10;
      grdTimeTable.RowCount = 10;
      grdTimeTable.Columns[0].Width = 100;
      grdTimeTable.Columns[1].Width = 100;
      grdTimeTable.Columns[2].Width = 20;
      grdTimeTable.Columns[3].Width = 100;
      grdTimeTable.Columns[4].Width = 100;
      grdTimeTable.Columns[5].Width = 20;
      grdTimeTable.Columns[6].Width = 100;
      grdTimeTable.Columns[7].Width = 100;
       //grdTimeTable.Rows(0).Cells(0).Value = "Semister";
       grdTimeTable.Columns[0].HeaderText = "I Row";
       grdTimeTable.Columns[1].HeaderText = "II Row";
       grdTimeTable.Columns[2].HeaderText = "";
       grdTimeTable.Columns[3].HeaderText = "III Row";
       grdTimeTable.Columns[4].HeaderText = "IV Row";
       grdTimeTable.Columns[5].HeaderText = "";
       grdTimeTable.Columns[6].HeaderText = "V Row";
       grdTimeTable.Columns[7].HeaderText = "VI Row";

       int a = 1, b = 0, c = 0;
       DateTime d1 = DateTime.Today.Date;
       string str1 = "";
       str1 = ddlSemister.SelectedValue;
       d1 = new DateTime(int.Parse(str1.Substring(6, 4)), int.Parse(str1.Substring(3, 2)), int.Parse(str1.Substring(0, 2)));

       if (conn.State == ConnectionState.Open) { conn.Close(); }
       conn.Open();
       SqlCommand cmd = new SqlCommand();
       SqlDataReader dr;
       cmd.Connection = conn;
       cmd.CommandText = "select Regno,deskno,deskside,semister from AllotmentTab where RoomNo='" + ddlSemister.SelectedValue + "' and examdate='" + d1 + "' and esession='" + ddlSession.SelectedValue + "'  order by Deskno,deskside";
       dr = cmd.ExecuteReader();
       while (dr.Read())
       {
           b = int.Parse(dr.GetValue(1).ToString());
           if (b > 14)
           {
               b = b - 14;
               c = 6;
           }
           else if (b > 7)
           {
               b = b - 7;
               c = 3;
           }
           else
           {
               //b = b - 7;
               c = 0;
           }
           if (dr.GetValue(2).ToString() == "L")
           {
               grdTimeTable.Rows[b].Cells[c] = dr.GetValue(0).ToString() + " (" + dr.GetValue(3).ToString() + ")";
           }
           else
           {
               grdTimeTable.Rows[b].Cells[c + 1] = dr.GetValue(0).ToString() + " (" + dr.GetValue(3).ToString() + ")";
           }
           a++;

           if ((a % 7) == 0)
           {

           }

       }



       //Alloted Faculty :
       if (conn.State == ConnectionState.Open) { conn.Close(); }
       conn.Open();
       SqlCommand cmd5 = new SqlCommand();
       SqlDataReader dr5;
       cmd5.Connection = conn;
       cmd5.CommandText = "select facultycode from fAllotmentTab where RoomNo='" + ddlSemister.SelectedValue + "' and examdate='" + d1 + "' and esession='" + ddlSession.SelectedValue + "'";
       dr5 = cmd5.ExecuteReader();
       if (dr5.Read())
       {
           lblMessage.Text = "Alloted Faculty : " + dr5.GetValue(0).ToString();
       }
       else { lblMessage.Text = "Alloted Faculty : "; }
   }

hi here m getting error like

Line 97:                 grdTimeTable.Rows[b].Cells[c] = dr.GetValue(0).ToString() + " (" + dr.GetValue(3).ToString() + ")";

Compiler Error Message: CS0200: Property or indexer 'System.Web.UI.WebControls.TableCellCollection.this[int]' cannot be assigned to -- it is read only

and one more error is

CS1061: 'System.Web.UI.WebControls.GridView' does not contain a definition for 'ColumnCount' and no extension method 'ColumnCount' accepting a first argument of type 'System.Web.UI.WebControls.GridView' could be found (are you missing a using directive or an assembly reference?)

Posted 5-Mar-12 2:48am

ythisbug

Updated 5-Mar-12 23:38pm

Manfred Rudolf Bihy

v4

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Manfred Rudolf Bihy 5-Mar-12 9:10am

Title adjustment from "hi can u solve my problem?"

ythisbug 6-Mar-12 1:38am

hi friend please help me.this s my project.i stuck in this page.any one help me?

Manfred Rudolf Bihy 6-Mar-12 5:39am

Don't use meaningless titles like "Hi can you solve my problem". If you change this back one more time I'll just delete the whole question.

ythisbug 6-Mar-12 5:47am

ok bro sorry

2 solutions

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Manfred Rudolf Bihy · Answer 1 · 2012-03-05T03:06:00

Solution 1

The compiler told you already what is wrong with your statement. The cell collection can not be written to, but only read from. I can only assume that you didn't want to write to the cell collection anyhow, but rather wanted to set the cell in question to a certain value. So you can try this:

C#

// Use the property Text of TableCell to set the left hand side string into the TableCell instance.
grdTimeTable.Rows[b].Cells[c].Text = dr.GetValue(0).ToString() + " (" + dr.GetValue(3).ToString() + ")";

I do suspect you'll run into other problems though as I can see that you're accessing rows that may have not yet been created yet. Since there is not enough known about your grid view and as it is passed in as a global variable (cough, cough), we don't know the current state it is in.

Regards,

Manfred

Posted 5-Mar-12 3:06am

Manfred Rudolf Bihy

Updated 5-Mar-12 3:12am

v2

Comments

Sergey Alexandrovich Kryukov 5-Mar-12 18:06pm

Right, a 5.
--SA

ythisbug 5-Mar-12 22:45pm

hi manfred thanks that i solved now m getting another error..can any one help me..

Error 1 'System.Web.UI.WebControls.GridView' does not contain a definition for 'ColumnCount' and no extension method 'ColumnCount' accepting a first argument of type 'System.Web.UI.WebControls.GridView' could be found (are you missing a using directive or an assembly reference?) C:\Users\admin\Documents\Visual Studio 2008\WebSites\SeatAllotment\RoomAllotmentDisplay.aspx.cs 44 22 C:\...\SeatAllotment\

for this m getting error..
grdTimeTable.ColumnCount = 10;
grdTimeTable.RowCount = 10;
grdTimeTable.Columns[0].Width = 100;
grdTimeTable.Columns[1].Width = 100;
grdTimeTable.Columns[2].Width = 20;
grdTimeTable.Columns[3].Width = 100;
grdTimeTable.Columns[4].Width = 100;
grdTimeTable.Columns[5].Width = 20;
grdTimeTable.Columns[6].Width = 100;
grdTimeTable.Columns[7].Width = 100;

Manfred Rudolf Bihy · Answer 2 · 2012-03-05T23:50:00

You should really learn to use Goolgle and/or the MSDN documentation. The compiler already told you that there is no such property so you must have made a mistake. Why infact should there be a property ColumnCount on the gridview itself? The gridview already has a collection of its columns exposed as the property named, appropriately I must say, Columns. Knowing a bit about object orientation, who in your opinion should know about the number of columns present in that collection?

If your answer was the collection itself, then you are one hundred percent correct! So now you either go to the MSDN documentation and hunt down all the properties present in the collection exposed by the gridview's property named Columns, or you do some fancy guesswork as properties denoting the number of elements in some collection are usually called Count you go and try this instead:

gridViewNameWhatEverThatMayBe.Columns.Count

As I'm seeing that you are trying to assign to Count I must say you're out of luck as this property is readonly[^]. You'll have to find some other way to add columns and rows to your gridview.

Regards,

Manfred