how to clear datagridview in c#

You don't clear the grid, you clear the data

DataGridView.DataSource = null;

Try this :

dataGridView1.Rows.Clear()

OR

dt.Rows.Clear() // If dgv is bound to datatable
dataGridView1.DataBind();

OR

Use this code to check if you are bound to a data source :

//Code Block
if (this.dataGridView1.DataSource != null)
{
     this.dataGridView1.DataSource = null;
}
else
{
    this.dataGridView1.Rows.Clear();
}

this.dataGridView1.Rows.Clear();

removes rows. In my case I dave a DGV with 5 rows, after

this.dataGridView1.Rows.Clear();

I found my DGV has only 1 row.
I tried

this.dataGridView1.Columns.Clear();

with the same results - number of columns was changed. So what I am doing now is a loop with manually moving "" to each cell.

Hi Every One I have tried to reload the datagridview rows at every time i click the button. but the problem is we can't reload the datagridview in windows forms like gridview in asp in asp for every button click event the page will be reloaded so the grid will updated with values but in windows forms it will not happen so we have to clear for clear we can't use

datagridview1.Rows.Clear()

it will raise the error so, i search for solutions in many websites but i can't get it at that time i got this below idea using this we can remove our rows in grid and we can rebind it with our new values

if (datagridview1.RowCount > 0)
{
for (int i = 0; i <= datagridview1.RowCount; i++)
{
datagridview1

.Rows.RemoveAt(0);
}
}

U can use this code to solve your problem.

DataGridView.DataSource = null;

AND

dataGridView1.Rows.Clear()

Thanks & regard
Sham

Try this:

dataGridView1.Rows.Clear(); // clear rows form dataGridView
dataGridView1.Refresh(); // refresh dataGridView

foreach (Control field in container.Controls)
{
    if (field is TextBox)
        ((TextBox)field).Clear();
    else if (field is ComboBox)
        ((ComboBox)field).SelectedIndex=0;
    else
        dgView.DataSource = null;
        ClearAllText(field);
}