Create Password Column in DataGridView using C# and VB.Net in Windows Application

Hi nid@patel,

Check this example. Now please take its reference and correct your code.

Code

C#

private void Form1_Load(object sender, EventArgs e)
{
    this.BindDataGrid();
    dataGridView1.SelectionMode = DataGridViewSelectionMode.CellSelect;
    dataGridView1.MultiSelect = false;
    dataGridView1.CellFormatting += new DataGridViewCellFormattingEventHandler(dataGridView1_CellFormatting);
    dataGridView1.EditingControlShowing += new DataGridViewEditingControlShowingEventHandler(dataGridView1_EditingControlShowing);
}

private void BindDataGrid()
{
    System.Data.DataTable dt = System.Data.new DataTable();
    dt.Columns.AddRange(new System.Data.DataColumn[] { new System.Data.DataColumn("Name"), new System.Data.DataColumn("Password") });
    dt.Rows.Add("John Hammond", "password123");
    dt.Rows.Add("Mudassar Khan", "123");
    dt.Rows.Add("Suzanne Mathews", "78963");
    dt.Rows.Add("Robert Schidner", "a@12@jhg");
    this.dataGridView1.DataSource = dt;
}

void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
    if (dataGridView1.Columns[e.ColumnIndex].Index == 1)
    {
        if (e.Value != null)
        {
            e.Value = new string('*', e.Value.ToString().Length);
            e.FormattingApplied = true;
        }
    }
}

void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
    TextBox t = e.Control as TextBox;
    if (t != null)
    {
        t.Text = (string)dataGridView1.SelectedCells[0].Value.ToString();
    }
}

private void button1_Click(object sender, EventArgs e)
{
    string passwords = "";
    for (int i = 0; i < dataGridView1.Rows.Count; i++)
    {
        passwords += dataGridView1.Rows[i].Cells[1].Value + "\n";
    }

    MessageBox.Show(passwords);
}

VB.Net

Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
    Me.BindDataGrid()
    dataGridView1.SelectionMode = DataGridViewSelectionMode.CellSelect
    dataGridView1.MultiSelect = False
    AddHandler dataGridView1.CellFormatting, AddressOf dataGridView1_CellFormatting
    AddHandler dataGridView1.EditingControlShowing, AddressOf dataGridView1_EditingControlShowing
End Sub

Private Sub BindDataGrid()
    Dim dt As DataTable = New DataTable()
    dt.Columns.AddRange(New DataColumn() {New DataColumn("Name"), New DataColumn("Password")})
    dt.Rows.Add("John Hammond", "password123")
    dt.Rows.Add("Mudassar Khan", "123")
    dt.Rows.Add("Suzanne Mathews", "78963")
    dt.Rows.Add("Robert Schidner", "a@12@jhg")
    Me.dataGridView1.DataSource = dt
End Sub

Private Sub dataGridView1_CellFormatting(ByVal sender As Object, ByVal e As DataGridViewCellFormattingEventArgs)
    If dataGridView1.Columns(e.ColumnIndex).Index = 1 Then
        If e.Value IsNot Nothing Then
            e.Value = New String("*"c, e.Value.ToString().Length)
            e.FormattingApplied = True
        End If
    End If
End Sub

Private Sub dataGridView1_EditingControlShowing(ByVal sender As Object, ByVal e As DataGridViewEditingControlShowingEventArgs)
    Dim t As TextBox = TryCast(e.Control, TextBox)
    If t IsNot Nothing Then
        t.Text = CStr(dataGridView1.SelectedCells(0).Value.ToString())
    End If
End Sub

Private Sub button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles button1.Click
    Dim passwords As String = ""
    For i As Integer = 0 To dataGridView1.Rows.Count - 1
        passwords += dataGridView1.Rows(i).Cells(1).Value & vbLf
    Next

    MessageBox.Show(passwords)
End Sub

Screenshot