'No mapping exists from object type system.windoes.control to a known managed provider native type.' WPF C#

private void btnSave_Click(object sender, RoutedEventArgs e)
     {
         if (txtCompanyId.Text == "")
         {
             MessageBox.Show("Please Enter CompanyId", "Fill Field", MessageBoxButton.OK, MessageBoxImage.Information);
             txtCompanyId.Focus();
         }
         else if (txtCompanyName.Text == "")
         {
             MessageBox.Show("Please fill CompanyName", "Fill Field", MessageBoxButton.OK, MessageBoxImage.Information);
             txtCompanyName.Focus();
         }
         else if (txtCaption.Text == "")
         {
             MessageBox.Show("Please fill Caption", "Fill Field", MessageBoxButton.OK, MessageBoxImage.Information);
             txtCaption.Focus();
         }
         else if (txtAddress1.Text == "")
         {
             MessageBox.Show("Please fill Address1", "Fill Field", MessageBoxButton.OK, MessageBoxImage.Information);
             txtAddress1.Focus();
         }
         else if (txtAddress2.Text == "")
         {
             MessageBox.Show("Please fill Address2", "Fill Field", MessageBoxButton.OK, MessageBoxImage.Information);
             txtAddress2.Focus();
         }
        else if(txtMobile.Text == "")
         {
             MessageBox.Show("Please fill MobileNo", "Fill Field", MessageBoxButton.OK, MessageBoxImage.Information);
             txtMobile.Focus();
         }
         else if(txtEmail.Text == "")
         {
             MessageBox.Show("Please fill Email", "Fill Field", MessageBoxButton.OK, MessageBoxImage.Information);
             txtEmail.Focus();
         }
         else if(txtGstin.Text == "")
         {
             MessageBox.Show("Please fill Gstin", "Fill Field", MessageBoxButton.OK, MessageBoxImage.Information);
             txtGstin.Focus();
         }
         else if(txtCloudApi.Text == "")
         {
             MessageBox.Show("Please fill CloudApi", "Fill Field", MessageBoxButton.OK, MessageBoxImage.Information);
             txtCloudApi.Focus();
         }
        else if(txtUsername.Text == "")
         {
             MessageBox.Show("Please fill Username", "Fill Field", MessageBoxButton.OK, MessageBoxImage.Information);
             txtUsername.Focus();
         }
         else if(txtPassword.ToString() == "")
         {
             MessageBox.Show("Please fill Password", "Fill Field", MessageBoxButton.OK, MessageBoxImage.Information);
             txtPassword.Focus();
         }
         else if(txtActivationKey.Text == "")
         {
             MessageBox.Show("Please fill ActivationKey", "Fill Field", MessageBoxButton.OK, MessageBoxImage.Information);
             txtActivationKey.Focus();
         }
         else
         {
             try
             {
                 SqlConnection conn = new SqlConnection(ConnectionString);
                 conn.Open();
                 SqlCommand cmd = new SqlCommand("add_profile_details", conn);
                 cmd.CommandType = CommandType.StoredProcedure;
                 cmd.Parameters.AddWithValue("@company_id", SqlDbType.VarChar).Value = txtCompanyId;
                 cmd.Parameters.AddWithValue("@company_name", SqlDbType.VarChar).Value = txtCompanyName;
                 cmd.Parameters.AddWithValue("@caption", SqlDbType.VarChar).Value = txtCaption;
                 cmd.Parameters.AddWithValue("@address1", SqlDbType.VarChar).Value = txtAddress1;
                 cmd.Parameters.AddWithValue("@address2", SqlDbType.VarChar).Value = txtAddress2;
                 cmd.Parameters.AddWithValue("@mobileno", SqlDbType.VarChar).Value = txtMobile;
                 cmd.Parameters.AddWithValue("@email", SqlDbType.VarChar).Value = txtEmail;
                 cmd.Parameters.AddWithValue("@gstn", SqlDbType.VarChar).Value = txtGstin;
                 cmd.Parameters.AddWithValue("@username", SqlDbType.VarChar).Value = txtUsername;
                 cmd.Parameters.AddWithValue("@password", SqlDbType.VarChar).Value = txtPassword;
                 cmd.Parameters.AddWithValue("@selectusertype", SqlDbType.VarChar).Value = txtcombox;
                 cmd.Parameters.AddWithValue("@uploadlogo", SqlDbType.VarChar).Value = picUserimage;
                 cmd.Parameters.AddWithValue("@activationkey", SqlDbType.VarChar).Value = txtActivationKey;
                 //conn.Open();
                 cmd.ExecuteNonQuery();
                 conn.Close();
                 MessageBox.Show("Successfully saved", "Fill Field", MessageBoxButton.OK, MessageBoxImage.Information);
             }
             catch (Exception ex)
             {
                 MessageBox.Show(ex.Message, "Error", MessageBoxButton.OK, MessageBoxImage.Information);
             }
         }

     }

try
{
    SqlConnection conn = new SqlConnection(ConnectionString);
    conn.Open();
    SqlCommand cmd = new SqlCommand("add_profile_details", conn);
    cmd.CommandType = CommandType.StoredProcedure;
    cmd.Parameters.AddWithValue("@company_id", SqlDbType.VarChar).Value = txtCompanyId;
    cmd.Parameters.AddWithValue("@company_name", SqlDbType.VarChar).Value = txtCompanyName;
    cmd.Parameters.AddWithValue("@caption", SqlDbType.VarChar).Value = txtCaption;
    cmd.Parameters.AddWithValue("@address1", SqlDbType.VarChar).Value = txtAddress1;
    cmd.Parameters.AddWithValue("@address2", SqlDbType.VarChar).Value = txtAddress2;
    cmd.Parameters.AddWithValue("@mobileno", SqlDbType.VarChar).Value = txtMobile;
    cmd.Parameters.AddWithValue("@email", SqlDbType.VarChar).Value = txtEmail;
    cmd.Parameters.AddWithValue("@gstn", SqlDbType.VarChar).Value = txtGstin;
    cmd.Parameters.AddWithValue("@username", SqlDbType.VarChar).Value = txtUsername;
    cmd.Parameters.AddWithValue("@password", SqlDbType.VarChar).Value = txtPassword;
    cmd.Parameters.AddWithValue("@selectusertype", SqlDbType.VarChar).Value = txtcombox;
    cmd.Parameters.AddWithValue("@uploadlogo", SqlDbType.VarChar).Value = picUserimage;
    cmd.Parameters.AddWithValue("@activationkey", SqlDbType.VarChar).Value = txtActivationKey;
    //conn.Open();
    cmd.ExecuteNonQuery();
    conn.Close();
    MessageBox.Show("Successfully saved", "Fill Field", MessageBoxButton.OK, MessageBoxImage.Information);
}
catch (Exception ex)
{
    MessageBox.Show(ex.Message, "Error", MessageBoxButton.OK, MessageBoxImage.Information);
}