How to maintain Gridview with multiple rows

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Hi,
Good Evening,

This is the method when clicking a button

protected void btnAdd_Click(object sender, EventArgs e)
{
if (cboSources.SelectedIndex != -1)
{
grdViewDisease.DataSource = GetDataTable(cboSources.SelectedValue);
grdViewDisease.DataBind();
}

}

This is for binding data and calling in the above method

private DataTable GetDataTable(string itemID)
{
DataTable dt = new DataTable();
dt.Columns.Add("ID", typeof(string));
dt.Columns.Add("Disease", typeof(string));
dt.Columns.Add("Source", typeof(string));
dt.Rows.Add(itemID, hidSource.Attributes["value"], cboSources.SelectedItem);
return dt;
}

So after adding a new row and binding it to the grid I can add a new row but old row values are not shown

So please explain how to retain all the values?

Thank You

Posted 28-Jan-14 1:15am

Member 8557048

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londhess · Answer 1 · 2014-01-28T01:45:00

Solution 1

Well you are adding only one row.In your GetDataTable method,you are creating the new datatable everytime and returing that new datatable.Because of this it will return new values and vanish old value.

For solving this issue,you just globally declare Datatable variable and check.

Posted 28-Jan-14 1:45am

londhess

Dinesh.V.Kumar · Answer 2 · 2014-01-28T01:45:00

Try this!!

C#

DataTable dt = null;



protected void btnAdd_Click(object sender, EventArgs e)
 {
 if (cboSources.SelectedIndex != -1)
 {
 grdViewDisease.DataSource = GetDataTable(cboSources.SelectedValue);
 grdViewDisease.DataBind();
 }

 }
 



private DataTable GetDataTable(string itemID)
 {
if(viewstate["dt"]==null)
{
  dt = new DataTable();
 
 dt.Columns.Add("ID", typeof(string));
 dt.Columns.Add("Disease", typeof(string));
 dt.Columns.Add("Source", typeof(string));
}
else
{
  dt=(DataTable)viewstate["dt"];
}
 
 dt.Rows.Add(itemID, hidSource.Attributes["value"], cboSources.SelectedItem);
 viewstate["dt"]=dt;
 return dt;
 }