c# sql cannot convert varchar to int (Found a work around) - c#

im trying to insert some data into a sql server and the code worked fine untill i added the #instel at the end. when i added that i got the error "Error converting data type varchar to numeric." even if i leave the textbox empty.
i had it as a textbox but since i got the error i tried to have it as a variable but it still did not fix the issue. the code works for the REL thats to be inserted and that is also a int. also the database and textbox properties of REL and #instel are the same. i also tried to make the variable a int but it did not change anything. if anyone knows why this is and could help me out it would be appriciated.
SqlCommand slMEVO_NAW = new SqlCommand(#"insert into NAW(REL,NAAM,BTW_CODE,TAV,STR,PL,LAND,PLBOX,TAAL,COUNTRY_C,TEL,FAX,EMAIL,XMAS,TEL2,STR1,INSTELINCL,INCOTERMS,PRODDAT,INSTEL) values('" + this.Txtbx_RelNmmr.Text + "','" + this.Txtbx_Bedrijf.Text + "','" + this.Txtbx_BtwCode.Text + "','" + this.Txtbx_Tav.Text + "','" + this.Txtbx_HuisAdres.Text + "','" + this.Txtbx_PstCde.Text + "','" + this.Txtbx_Land.Text + "','" + this.Txtbx_PstBs.Text + "','" + this.Txtbx_Taal.Text + "','" + this.Txtbx_LndCode.Text + "','" + this.Txtbx_Telnmmr.Text + "','" + this.Txtbx_Fax.Text + "','" + this.Txtbx_Email.Text + "','" + this.Txtbx_Xmas.Text + "','" + this.Txtbx_telnmmr2.Text + "','" + this.Txtbx_BezAdres.Text + "','" + this.TBX_Instelkstn.Text + "','" + this.Txtbx_Incot.Text + "','" + this.TBX_PrdctDtm.Text + "','#INSTEL' );", Connectie.connMEVO_NAW);
slMEVO_NAW.Parameters.Add("#INSTEL", SqlDbType.VarChar).Value = Txtbx_InstelKsten.Text;
FIX
it seems that after i changed it to all parameters it only gives the error if the textbox is empty so i just make the program set the text to 0 before it does the query right now


The type of field in your table might be as Integer or Numeric, change to Varchar.


as i stated in the main post after a edit i found a way to work around the problem
FIX it seems that after i changed it to all parameters it only gives the error if the textbox is empty so i just make the program set the text to 0 before it does the query right now

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I see in the first part you have 29 fields, but the inserted fields are 30...
In addition, you should use parameterized queries to avoid sql injection.

You need to debug codes and paste your CommandText to SSMS(SQL Sever Management Studio) to figure out errors.
Other suggestions:
command.CommandText = string.format("insert into StudentsRecord(..) VALUES(#...)); sql params to avoid sql injection
using(SqlConnection conn = ...)

Already solved the problem just now by putting [ ] on each field. which will be something like this:
insert into StudentsRecord(
[StudentID],[Name],[Section],[Semester],
[MathPrelim],[MathMidterm],[MathFinals]
) values ('"++"'..) ... etc.
Thanks everyone who tried to help me, have a good day!

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Mabuhay!
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