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POPopulating TextBox, The data type is not valid for the boolean operation
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copied!<p>I got a ComboBox with a table as data source, ID as a value member and a name as a display member. Selecting a name from the ComboBox should populate 6 TextBoxes with data.</p> <p>Exception:</p> <pre><code>The data type is not valid for the boolean operation. [ Data type (if known) = int,Data type (if known) = nvarchar ] </code></pre> <p>Code:</p> <pre><code>void FillComboBox() { //Fill Combo Box SqlCeDataAdapter da = new SqlCeDataAdapter(" SELECT CustomerID, Name FROM Customers", clsMain.con); DataSet ds = new DataSet(); da.Fill(ds); cBox1.DataSource = ds.Tables[0]; cBox1.ValueMember = "CustomerID"; cBox1.DisplayMember = "Name"; } public frmMain() { InitializeComponent(); } private void frmMain_Load(object sender, EventArgs e) { clsMain.con.ConnectionString = @"Data Source=|DataDirectory|\Database\Sales.sdf"; clsMain.con.Open(); FillComboBox(); } private void btnSave_Click(object sender, EventArgs e) { //Save Button SqlCeCommand cmd = new SqlCeCommand(); cmd.CommandType = CommandType.Text; cmd.CommandText = " INSERT INTO Customers (Name, Phone1, Phone2, Address, Notes) VALUES (@Name, @Phone1, @Phone2, @Address, @Notes) "; cmd.Connection = clsMain.con; cmd.Parameters.AddWithValue("@Name", txt2.Text.Trim()); if (txt3.Text != "") { cmd.Parameters.AddWithValue("@Phone1", Convert.ToInt32(txt3.Text)); } else { cmd.Parameters.AddWithValue("@Phone1", Convert.DBNull); } if (txt4.Text != "") { cmd.Parameters.AddWithValue("@Phone2", Convert.ToInt32(txt4.Text)); } else { cmd.Parameters.AddWithValue("@Phone2", Convert.DBNull); } cmd.Parameters.AddWithValue("@Address", txt5.Text.Trim()); cmd.Parameters.AddWithValue("@Notes", txt6.Text.Trim()); cmd.ExecuteNonQuery(); MessageBox.Show("Data stored."); } private void cBox1_SelectedIndexChanged(object sender, EventArgs e) { if (cBox1.SelectedIndex >= 0) { String Code = "SELECT * FROM Customers WHERE CustomerID=" + cBox1.SelectedValue.ToString(); SqlCeDataAdapter da = new SqlCeDataAdapter(Code, clsMain.con); DataSet ds = new DataSet(); da.Fill(ds); txt1.Text = ds.Tables[0].Rows[0]["CustomerID"].ToString(); txt2.Text = ds.Tables[0].Rows[0]["Name"].ToString(); txt3.Text = ds.Tables[0].Rows[0]["Phone1"].ToString(); txt4.Text = ds.Tables[0].Rows[0]["Phone2"].ToString(); txt5.Text = ds.Tables[0].Rows[0]["Address"].ToString(); txt6.Text = ds.Tables[0].Rows[0]["Notes"].ToString(); } } </code></pre> <p>Table Details:</p> <p><img src="https://i.stack.imgur.com/hoifB.jpg" alt="enter image description here"></p>

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