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POUpdate Datagridview From Another Form
 

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    <p>First I should say i saw this link : </p> <p><a href="https://stackoverflow.com/questions/2395624/how-to-refresh-datagridview-when-closing-child-form">How to refresh datagridview when closing child form?</a></p> <p>And i did like this: (i have datagridview in Form1) <strong>Form1:</strong></p> <pre><code> public void FillDataGridView(DataTable dt1) { bindingSource1.DataSource = dt1; bindingSource1.ResetBindings(false); dataGridView1.DataSource = bindingSource1; //here i checked number of rows of dt1 and it shows the correct value } </code></pre> <p><strong>Form2:</strong></p> <pre><code> SqlConnection cnn = new SqlConnection(@"My connection string"); private Form1 Handled_frm1; public Form2(Form1 frm1) { InitializeComponent(); Handled_frm1 = frm1; } private void textbox1_TextChanged(object sender, EventArgs e) { dt.Clear(); using (SqlCommand cmd =cnn.CreateCommand()) { if (cnn.State == ConnectionState.Closed) { cnn.Open(); } cmd.CommandType = CommandType.StoredProcedure; cmd.Connection = cnn; cmd.CommandText = "spSearchCustomerByName"; SqlParameter inparam1 = cmd.Parameters.AddWithValue("@name", textbox1.Text); inparam1.Direction = ParameterDirection.Input; dap.SelectCommand = cmd; dap.Fill(dt); Handled_frm1.FillDataGridView(dt); } </code></pre> <p>But the value Of Datagridview does not change!</p> <p><strong>Edited:</strong></p> <p>I wanted to test that if i can clear datagrid view or not,so i changed FillDataGridView like this :</p> <pre><code> public void FillDataGridView(DataTable dt1) { dt.Clear(); dataGridView1.Columns.Clear(); dataGridView1.DataSource = null; dataGridView1.Refresh(); } </code></pre> <p>but it does not clear datagridview1!!!</p>
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    1. COYour code does not show how the data underlying the second form relates to the data table you use in the first form. Where is, e.g., cnn initialized?
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    2. COProbably a similar type SO question - http://stackoverflow.com/questions/2947818/updating-datagridview-from-another-form-using-backgroundworker ?
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    3. CO@JohnB:cnn initialized in Form2,i edited my question
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