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c#, undound datagrid, header text

Posted on 2007-11-19
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Last Modified: 2010-04-21
how can I change the header text on an unbound datagrid that has columns dynamically generated at runtime?  I am using the attached code to create the table , but the dynamically generated columns only come up with the column name for the header.
private DataTable datbl()
		{
			DataTable tbl = new DataTable("X");
			DataColumn Coldt;
			DataRow Rowdt; 
			Coldt = new DataColumn();
			Coldt.DataType= System.Type.GetType("System.Int32");
			Coldt.ColumnName = "ID";
			Coldt.AutoIncrement = true;
			Coldt.Caption = "EMPID";
			Coldt.ReadOnly = true;
			Coldt.Unique = true;
 
			tbl.Columns.Add(Coldt);
 
			Coldt = new DataColumn();
			Coldt.DataType= System.Type.GetType("System.String");
			Coldt.ColumnName = "FName";
			Coldt.AutoIncrement = false;
			Coldt.Caption = "Employee First Name";
			Coldt.ReadOnly = false;
			Coldt.Unique = false;
			tbl.Columns.Add(Coldt);
 
			Coldt = new DataColumn();
			Coldt.DataType= System.Type.GetType("System.String");
			Coldt.ColumnName = "LName";
			Coldt.AutoIncrement = false;
			Coldt.Caption = "Employee Last Name";
			Coldt.ReadOnly = false;
			Coldt.Unique = false;
			tbl.Columns.Add(Coldt);
 
			Rowdt = tbl.NewRow();
			Rowdt["ID"] = 0001;
			Rowdt["FName"] = "Kasi";
			Rowdt["LName"] = "Viswanath" ;
			tbl.Rows.Add(Rowdt);
 
			Rowdt = tbl.NewRow();
			Rowdt["ID"] = 0002;
			Rowdt["FName"] = "Arun";
			Rowdt["LName"] = "Kumar" ;
			tbl.Rows.Add(Rowdt);
			
			Rowdt = tbl.NewRow();
			Rowdt["ID"] = 0003;
			Rowdt["FName"] = "Srivasan";
			Rowdt["LName"] = "Ramachandran" ;
			tbl.Rows.Add(Rowdt);
 
			return tbl;
 
			
		}
 
//Draw Table
bindtbl  = datbl();
Session["DataTable"] = bindtbl;
DataGrid1.DataSource = Session["DataTable"];
DataGrid1.DataBind();

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Question by:soltan8
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Expert Comment

by:topdog770
ID: 20313311
Here's a couple of ideas.

1) Use the designer to add unbound datacolumns to the datagridview.  Set the header text with the name(s) you are wanting and set the DataPropertyName to match the column names you set in the code above.  You'd have DataPropertyNames of ID, LName, etc

2) In your code, you can also do the same process I've layed out above.  Create Columns for the DataGridView and set the DataPropertyNames
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Author Comment

by:soltan8
ID: 20313495
I probablly should have mentioned that this is .net 1.1 using VS 2003.  I don't think I have the option of using a DataGridView(At least I don't see it as an option).  If I'm wrong, please give me an example of how to use it.. Thanks
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Expert Comment

by:topdog770
ID: 20313570
My fault, I should have scrolled down the code.


void FormatColumns()
		{
			DataGridTableStyle dgTableStyle = new DataGridTableStyle();
			dgTableStyle.MappingName = "X"; // name of data table
 
			DataGridColumnStyle dgColumnStyle = new DataGridTextBoxColumn();
			dgColumnStyle.MappingName = "ID";
			dgColumnStyle.HeaderText = "EMPID";
			dgColumnStyle.Width = 45;
			dgTableStyle.GridColumnStyles.Add(dgColumnStyle);
 
			dgColumnStyle = new DataGridTextBoxColumn();
			dgColumnStyle.MappingName = "FName";
			dgColumnStyle.HeaderText = "Employee First Name";
			dgColumnStyle.Width = 120;
			dgTableStyle.GridColumnStyles.Add(dgColumnStyle);
 
			dgColumnStyle = new DataGridTextBoxColumn();
			dgColumnStyle.MappingName = "LName";
			dgColumnStyle.HeaderText = "Employee Last Name";
			dgColumnStyle.Width = 120;
			dgTableStyle.GridColumnStyles.Add(dgColumnStyle);
 
			DataGrid1.TableStyles.Add(dgTableStyle);
		}

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Expert Comment

by:topdog770
ID: 20313578
Call or use the functionality, then do the data binding
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Author Comment

by:soltan8
ID: 20313954
it is failing on DataGrid1.TableStyles.Add(dgTableStyle); This is a web form and apparently DataGrid1 does not have a TableStyles Property.  Any other ideas?
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Accepted Solution

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topdog770 earned 500 total points
ID: 20314437
Sorry, I'm really slow today.

In your aspx page configure the datagrid like this

The Key is Autogeneratecolumns = false;

Then you have to add each column you want visible.  I just changed the column header text, but you can configure formatting for dates, etc here as well.
			<asp:DataGrid id="DataGrid1" style="Z-INDEX: 101; LEFT: 112px; POSITION: absolute; TOP: 200px"
				runat="server" ForeColor="#FF8080" AutoGenerateColumns=False>
				<Columns>
				             <asp:BoundColumn DataField="ID"
HeaderText="EMPID"></asp:BoundColumn>
 
                    <asp:BoundColumn DataField="FName"
HeaderText="First Name"></asp:BoundColumn>
 
                    <asp:BoundColumn DataField="LName"
HeaderText="Last Name"></asp:BoundColumn>
 
                </Columns>
				
				</asp:DataGrid>

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Author Closing Comment

by:soltan8
ID: 31409954
Thanks so much!! That is exactly what I needed.
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Expert Comment

by:topdog770
ID: 20315366
Thank you for the A, soltan8
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