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Selection changed textbox value C#

Goran Bibic asked:

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If datagrid no have rows in my textbox have values from last selected values...

Need help IF DATAGRID NO HAVE VALUES TEXTBOX EMPTY

Thank you

What I have tried:

 private void testDataGridView_SelectionChanged(object sender, EventArgs e)
        {

            if (testDataGridView.SelectedRows.Count > 0) 
            {

            string test = testDataGridView.SelectedRows[0].Cells["columnname"].Value.ToString();

testTextBox.Text = test;

             }
         }
Tags: C#

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