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dynamic control at runtime with maintaining viewstate


Posted Date: 05 Jul 2008    Resource Type: Code Snippets    Category: ASP.NET WebForms
Author: Sujit KumarMember Level: Diamond    
Rating: Points: 2



Suppose you want to generate runtime control and add it with your page and you want that when your page goes for postback then the entered value is remain in your textbox etc.

then you have to do these things.

first create container control on aspx page like:









now on .cs you have to write to generate control and add control to this table Table1.

first create two static variable at class
public static int NoOfRows = 5;
public static int ctlID = 0;


now write a function to create control

public void createTable()
{
try
{
// Total number of cells per row (columns).
int cellCtr;
// Current cell counter
int cellCnt;

//rowCnt = row;
cellCnt = 4;
DataTable objDT = new DataTable();
objDT = clsInspection.Get_Faults();
for (int Counter = 1; Counter <= NoOfRows; Counter++)
{

// Create new row and add it to the table.
TableRow tRow = new TableRow();
Table1.Rows.Add(tRow);
for (cellCtr = 1; cellCtr <= cellCnt; cellCtr++)
{
// Create a new cell and add it to the row.

TableCell tCell = new TableCell();

if (cellCtr == 1)
{
DropDownList ddl = new DropDownList();
ddl.ID = "ddl_" + ctlID.ToString();
ddl.Width = 170;
ddl.CssClass = "dropdown";

ddl.DataSource = objDT;
ddl.DataTextField = "Faults";
ddl.DataValueField = "Fault_ID";
ddl.DataBind();
ddl.Items.Insert(0, "Select Faults");
tCell.Controls.Add(ddl);

}
else
{
TextBox txt = new TextBox();
txt.ID = "txt_" + ctlID.ToString();
txt.CssClass = "textbox";
txt.Width = 170;
tCell.Controls.Add(txt);
}

tRow.Cells.Add(tCell);

ctlID++;

}
}
}
catch (Exception ex)
{
//lblErrorMessage.Text = "Error : " + ex.Message.ToString();
//mdlPopup.Show();
}
}

now for maintaine viewstate you have to override method
protected override void CreateChildControls()
{
// Here we are recreating controls to persist the ViewState on every post back
if (Page.IsPostBack)
{
ctlID = 0;
NoOfRows += 1;
createTable();
}
else
{
createTable();
NoOfRows = 5;
}
}

the above method will maintane viewstate for your created control.

now you want that there will be a button on your page and when you click on button one new row will be crete with controls then you have to put button on page only and nothing to do for adding new row for Table1.



Responses
Author: adeel alvi    17 Jul 2008Member Level: Bronze   Points : 1
Great!!!

you were more better and simpler then msdn article regarding this topic.

"IT is simple to be difficult but it very difficult to be simple "

Regards

Adeel





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